Binary Search in C using Recursion

#include<stdio.h>

void bins(int lb,int ub,int item,int a[]);
void main()
 {
    int i,n,item,a[20];
    printf("Enter the size of an array: ");
    scanf("%d",&n);

    printf("Enter the elements of the array: " );
    for(i=0;i<n;i++)
        {
         scanf("%d",&a[i]);
        }

    printf("Enter the number to be search: ");
    scanf("%d",&item);


    bins(0,n-1,item,a);

 }

void bins(int lb,int ub,int item,int a[])
{
     int mid,flag=0;

     if(lb<=ub)
        {
          mid=(lb+ub)/2;
          if(item==a[mid])
            {
              flag=flag+1;
            }
          else if(item<a[mid])
          {
              return bins(lb,mid-1,item,a);
          }
          else
              return bins(mid+1,ub,item,a);
        }


       if(flag==0)
         printf("Number is not found.");
       else
         printf("Number is found at %d", mid+1);
}